This is a tonearm and cartridge stylus adjustment tool for record players, which is simple and practical to use. Clear scale, light weight and not easy to break. Features: High contrast cartridge alignment protractor provides improved visibility and eliminates tracking errors. Avoids the over-shoot distortion to keep fine quality sound. Works with an S -Shaped arm and any 1/2" mounted cartridge. Extra magnifier make you more clear when adjusting the overhang. Calibration protractor only, other accessories demo in the picture are not included. Specifications: Main color: white Main material: acrylic Item size: 190 * 40 * 2mm / 7.5 * 1.6 * 0.1in Item weight: 20g / 0.7ounce Package size: 190 * 40 * 10mm / 7.5 * 1.6 * 0.4in Package weight: 22g / 0.8ounce Packing List: 1 * Calibration Protractor